Air Actions, Arizona

Ground-Level Ozone Actions in Phoenix, AZ

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August 2014: Final Redesignation for the 1997 8-Hour Ozone Standard

August 20, 2014: EPA finalized its approval of a request submitted by the State of Arizona in March 2009, that that we redesignate the Phoenix-Mesa nonattainment area to attainment for the 1997 8-hour ozone national ambient air quality standard (NAAQS). We also finalized our approval of the State’s plan demonstrating the area will continue to attain the standard through 2025.

March 2014: Proposed Redesignation of the Phoenix-Mesa area to Attainment for the 1997 8-Hour Ozone Standard

March 14, 2014: EPA proposed to approve a request submitted by the State of Arizona in March 2009, that that we redesignate the Phoenix-Mesa nonattainment area to attainment for the 1997 8-hour ozone national ambient air quality standard (NAAQS). We also proposed to approve the State's plan demonstrating the area will continue to attain the standard through 2025.

May 2012: Final Approval of Attainment Plan for the 1997 8-Hour Standard for Ground-Level Ozone

May 25, 2012: EPA finalized approval of a state implementation plan (SIP) revision submitted by the State of Arizona on June 13, 2007, to demonstrate attainment of the 1997 8-hour ozone national ambient air quality standards (NAAQS) in the Phoenix-Mesa nonattainment area by June 15, 2009. EPA approved the submitted SIP revision based on our determination that it contains all of the SIP elements required for ozone nonattainment areas under title I, part D, subpart 1 of the Clean Air Act (CAA) for the 1997 8-hour ozone NAAQS.

March 2012: Proposed Approval of Attainment Plan for the 1997 8-Hour Standard for Ground-Level Ozone

March 30, 2012: EPA proposed to approve a state implementation plan (SIP) revision submitted by the State of Arizona on June 13, 2007, to demonstrate attainment of the 1997 8-hour ozone national ambient air quality standards (NAAQS) in the Phoenix-Mesa nonattainment area by June 15, 2009.

May 2005: Final Redesignation for the 1-hour Standard for Ground-Level Ozone

May 20, 2005: EPA finalized the redesignation of the Phoenix metropolitan area to attainment of the 1-hour national air quality standard for ground-level ozone, the primary component of smog, and approved the plan showing maintenance of the standard to 2015.

March 2005: Proposed Redesignation for the 1-Hour Standard for Ground-Level Ozone

March 14, 2005: EPA proposed to redesignate the Phoenix metropolitan area to attainment for the 1-hour national air quality standard for ground-level ozone, the primary component of smog, and proposed to approve the plan showing maintenance of the standard to 2015.

May 2001: Final Finding of Attainment for the 1-Hour Standard for Ground-Level Ozone

May 16, 2001: EPA finalized its finding of attainment for the Phoenix area for the 1-hour national air quality standard for ground-level ozone, the primary component of smog. The documents that support this finding are listed below.

March 1999: Proposed Updates to the Phoenix 15 Percent Rate of Progress Plan

March 19, 1999: EPA proposed minor changes to its 1998 15 percent rate of progress federal implementation plan (1998 FIP) for the metropolitan Phoenix ozone nonattainment area. The changes delete or add to the control strategy measures that have already been adopted in the Phoenix area. EPA proposed no new emission control regulations. This proposal did not alter EPA's basic conclusion that the Phoenix metropolitan area would meet the 15 percent Rate of Progress requirement as soon as practicable.

May 18, 1998: EPA determined that the Phoenix, Arizona ozone nonattainment area has in place sufficient control measures to meet the 15 percent rate of progress emission reduction requirement in the Clean Air Act.

October 1997: Phoenix Fails to Attain the 1-hour Standard for Ground-Level Ozone

October 27, 1997: EPA determined that the Phoenix metropolitan area failed to meet the health-based 1-hour air quality standard for ground-level ozone (smog) by its Clean Air Act deadline of November 15, 1996. As a result of this finding, the EPA reclassified the area's ozone air quality from "moderate" to "serious." This classification triggered new planning and control requirements to continue progress toward attaining the ozone standard by the end of 1999.